Experimental study on refrigeration system’s performance of the refrigerator truck using R404A refrigerant

A refrigerated system experimental bench using R404A as the refrigerant was built to address the current issues of high compressor discharge temperature and poor refrigeration performance of refrigerated systems for cold storage. The effects of compressor speed and temperature changes within the storage on the main refrigeration performance parameters of the system were studied and analyzed. The results show that when the rotational speed is increased from 2500-4500 rpm under the conditions of 32?C outside and 0?C inside, the highest system exhaust temperature is 84.3?C, which is lower than 90?C, and the maximum system COP is 3.86, and when the compressor speed is increased from 3500 rpm under the conditions of -5?C to 5?C, the system exhaust temperature is lower than 90?C. The COP can reach 2.74, especially at -5?C.